Sum of squares of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly five ways.
145, 4567, 38570, 183670, 630755, 1751365, 4187092, 8957100, 17583765
2 seqfan posts
Sun Feb 15 11:44:58 CET 2009 [seqfan] Re: Sequence A031702